A new method has been elaborated to predict the burst speed of aeroengine disks.The disks should overspeed or even break due to malfunction of control system

shaft decoupling or afterburning failure.In order to avoid catastrophic failure of an engine

it is required to allow a margin of the disk burst speed.When the maximum rotor speed approaches to the disk burst speed

the plastic strain attains to large value in strain hardening range.So the concepts of material and geometrical nonlinearities are employed

but it is very difficult to obtain the solution of the double nonlinear problems.An approximate large deformation large analytical method is proposed firstly.The basic equations are derived according to the variable thickness and temperature of the disks.Secondly

the computational procedure is described and the burst speeds of four tested disks are obtained from the calculations.At last

the calculated results are compared with the test data

and the differences are less than four percent.Therefrom

it is proved that the new method is simple

convinent and accurate for engineering application as well as it is applicable to a wide variety of disks.